Abstract: In the Ai-Sang zone, traps of various types are well developed. Main trap types include fault anticlines, block buried hills, salt diapirism anticlines, low-extent compressive anticlines and nontectonic traps. Among them, the traps related to rock body occupy an important position. The Late Hercynian, the Indosinian-Yanshanian and the Himalayan tectonic movements formed a series of traps in the zone. And significant breakthroughs in petroleum have obtained in the Ordovician, the Carboniferous and the Triassic traps.